Strange Gear box noises?

Hi All,

I know it's almost impossible to diagnose something where sounds is involved without having a sound clip but I am really looking for ideas or if anyway else has/had simular sounding issue.

Does anyone else notice what I can only really describe a sound like a loose syncro in 5th gear when driving on a flat or declined surface?
You can hear it over the typicall whine these GB's make and it fads in and out as your driving along.

It's doesn't seam to do it when under load at least not to where I can hear it.

any thoughts are welcome.

thanks

I did have the 3650 Ford TSB done about 2 yrs ago.
 
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